Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.

A unisex sleeping bag with a Lower limit of 23ºF means a man should be comfortable down to air temperatures of 23ºF. The same bag will also have a Comfort limit, in the realm of 32°F, so a woman would be comfortable down to an air temperature of 32ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.

A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.

The Compression Sack is the perfect solution for squishing down bulky soft items for organized packing. These burly sacks are built from a water-resistant 70D Nylon fabric, offering excellent strength to weight. They can allow compression down to one-third of their original volume, which means you save valuable space in your pack for other essentials.

Highlights

Packability

In a perfect world, with perfect contents this compresses down to 1/3rd of its original volume (i.e. from 15 to 5 liters)

Best Use

Internal pack organization, packing up whatever you feel like belongs in a bag that can be compressed

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Compression sacks are awesome, I ordered the 10L and my sleeping bag fits perfectly in there and as the name of the product says it compresses it to make my sleeping bag smaller (which is usually the bullets item in my backpack)....now I am 5'2" and have a specialty sleeping bag so it is smaller than most sleeping bags.

The large model tames a huge down huge sleeping bag for back pack travel. It's a bit of a hassle fighting the air out of the sleeping bag; but it's amazing how this sack smooshes down something so large and full of air. Don't compress your down stuff inside this indefinitely--the down must air out and "breathe'. I hang my sleeping bag upside down to air out after a camping trip. if you fold an inch or two collar in the sack before stuffing, you will have better luck, then pull down the handles to make things even and small. It's a must-have and very tough.

The large model tames a huge down huge sleeping bag for back pack travel. It's a bit of a hassle fighting the air out of the sleeping bag; but it's amazing how this sack smooshes down something so large and full of air. Don't compress your down stuff inside this indefinitely--the down must air out and "breathe'. I hang my sleeping bag upside down to air out after a camping trip. if you fold an inch or two collar in the sack before stuffing, you will have better luck, then pull down the handles to make things even and small. It's a must-have and very tough.